package miggy.cpu.operands;

import miggy.cpu.DataSize;
import miggy.cpu.Sys;
import miggy.utils.TextUtil;

/*
//  Miggy - Java Amiga Emulator
//  Copyright (c) 2008, Tony Headford
//  All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
//  following conditions are met:
//
//    o  Redistributions of source code must retain the above copyright notice, this list of conditions and the
//       following disclaimer.
//    o  Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
//       following disclaimer in the documentation and/or other materials provided with the distribution.
//    o  Neither the name of the Miggy Project nor the names of its contributors may be used to endorse or promote
//       products derived from this software without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
//  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
//  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
//  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
//  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
//  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// $Revision: 2 $
*/
public class AddressRegisterIndirectIndex implements Operand
{
	private final int reg;
	private final int displacement;
	private final int indexReg;
	private final boolean indexIsAddr;
	private final boolean indexIsLong;

	public AddressRegisterIndirectIndex(int reg, int displacement, int indexReg, boolean isAddr, boolean isLong)
	{
		this.reg = reg;
		this.displacement = displacement;
		this.indexReg = indexReg;
		this.indexIsAddr = isAddr;
		this.indexIsLong = isLong;
	}

	public final int get(DataSize size)
	{
		int address = Sys.CPU.getAddrRegister(reg);
		int index = 0;
		if(indexIsAddr)
			index = Sys.CPU.getAddrRegister(indexReg);
		else
			index = Sys.CPU.getDataRegister(indexReg);

		if(!indexIsLong)
			index &= 0x0000FFFF;

		return (Sys.MEM.peek(address + displacement + index, size) & size.mask());
	}

	public final void put(int value, DataSize size)
	{
		int address = Sys.CPU.getAddrRegister(reg);
		int index = 0;
		if(indexIsAddr)
			index = Sys.CPU.getAddrRegister(indexReg);
		else
			index = Sys.CPU.getDataRegister(indexReg);

		if(!indexIsLong)
			index &= 0x0000FFFF;

		Sys.MEM.poke(address + displacement + index, value, size);
	}

	public final int offset()
	{
		//16-bit read after instruction
		return 2;
	}

	@Override public String toString()
	{
		StringBuilder sb = new StringBuilder();
		sb.append('$');
		sb.append(TextUtil.toHexParam(displacement, DataSize.Byte, true));
		sb.append("(a");
		sb.append(reg);
		sb.append(",");
		sb.append((indexIsAddr ? 'a' : 'd'));
		sb.append(indexReg);
		sb.append((indexIsLong ? ".l)" : ".w)"));

		return sb.toString();
	}
}
